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Understanding and Measuring
IfQ Crosstalk
in Digital Microwave
Communications Systems
Chris Pedersen
August 1988
RF & Microwave
Measurement
Symposium
and
Exhibition
r/iD'l HEWLETT
~~ PACKARD
www.HPARCHIVE.com
ABSTRACT:
Crosstalk between the I and Q information channels of modem communication systems arises not only from
poor baseband isolation, but also from IF and RF impairments such as amplitude ripple and nonlinear phase
response. This paper discusses techniques to measure and quantify the combined effects of crosstalk, whereas
earlier papers discussed the effects separately. It also examines the causes as well as the effects of system per-
formance degradation.
AUTHOR:
Chris Pedersen, Product Manager, Stanford Park Division" Palo Alto, CA. BSEE 1984, Brigham Young University.
Joined HP in 1984 as Product Marketing Engineer responsible for developing vector modulation applications.
www.HPARCHIVE.com
Understanding and Measuring IIQ Crosstalk
in Digital Microwave Communication Systems
1. What is I/O Crosstalk?
2. What causes I/O Crosstalk?
3. How do transfer function amplitude and
group delay asymmetries cause I/O Crosstalk?
4. Measuring I/O Crosstalk
a. Through the system
b. Through a demodulator
c. Through a modulator
5. Relating I/O Crosstalk to C/N degradation
6. Summary
What is I/Q Crosstalk?
Crosstalk
~ ~~~tor ~CHANNEL